
shotleybuilder
Exploring Graphs with Elixir: service contexts p.92-93
The book states “define the function graph_service/0 within the body of the using/1 macro
in the GraphCommons.Graph module”
The code download shows this:
defmacro using(opts) do
graph_type = Keyword.get(opts, :graph_type)
graph_module = Keyword.get(opts, :graph_module)quote do # other (listings, new_graph) functions here def read_graph(graph_file), do: GraphCommons.Graph.read_graph(graph_file, unquote(graph_type)) def write_graph(graph_data, graph_file), do: GraphCommons.Graph.write_graph(graph_data, graph_file, unquote(graph_type)) end
end
def graph_service(), do: unquote(graph_module)
def gs() do
graph_service()
graph_info()
end
I’ve not been able to work through the error here and obtain the result shown in the book, namely:
iex> graph_service PropertyGraph
PropertyGraph
So, no solution from me, but I sense there’s more than a one problem here
First Post!

shotleybuilder
Okay, this was simply a case of moving
def graph_service(), do: unquote(graph_module)
into the macro.
The error is in the code download
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